Prometheus stats handler used too much memory.

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Title: One line description Prometheus stats handler used too much memory.

Description:

What issue is being seen? Describe what should be happening instead of the bug, for example: Envoy should not crash, the expected value isn't returned, etc.

Repro steps:

Include sample requests, environment, etc. All data and inputs required to reproduce the bug.

Note: The Envoy_collect tool gathers a tarball with debug logs, config and the following admin endpoints: /stats, /clusters and /server_info. Please note if there are privacy concerns, sanitize the data prior to sharing the tarball/pasting.

Admin and Stats Output:

Include the admin output for the following endpoints: /stats, /clusters, /routes, /server_info. For more information, refer to the admin endpoint documentation.

Note: If there are privacy concerns, sanitize the data prior to sharing.

Config:

Include the config used to configure Envoy.

Logs:

Include the access logs and the Envoy logs.

Note: If there are privacy concerns, sanitize the data prior to sharing.

Call Stack:

If the Envoy binary is crashing, a call stack is required. Please refer to the Bazel Stack trace documentation.